Premising from the fact that, before doing this post, I went to read the guide on how to write a scp card on this site, I would need some help from some person who knows how quantum mechanics works and in particular on the paradox of the schrodinger cat.
My idea was just to create a humanoid scp that was inspired by this, some advice on how to create it?
I will obviously think of myself writing everything then! I thank in advance who will help me

Moved to Ideas and Brainstorming. That said, generally if you want to write an SCP based on real-life concepts, it's good to do some background research of your own rather than relying on others to explain it. Also the Schrodinger's Cat thought experiment is a pretty popular topic for SCP drafts, so you'll need to be a lot more specific about what you want help in here.

First, Schrödinger's cat is a thought experiment, and the use of the term "paradox" is not a very good one. This thought experiment illustrates that the Copenhagen interpretation of quantum mechanic is unable to describe sufficiently well a system that has both a microscopic and a macroscopic component.

Quantum mechanics postulates that states can be in "superposition", meaning that you can add quantum states together and still get a valid quantum state, similar to how classical waves interact. If you want to get more mathsy, that is because the Schrödinger's equation, the equation that governs the rules of quantum mechanics, is linear, so a linear combination of its solutions is also a solution.

This is where we dive into interpretations of quantum mechanics. The most popular interpretation by far is the Copenhagen interpretation. In its framework, when a systems is measured, superposition is destroyed.

The problem that Schrödinger's cat thought experiment poses is an antithesis to the Copenhagen interpretation. It applies the idea of superposition to macroscopic (big) objects, in this particular case, a cat. If the Copenhagen interpretation were true, then the cat is in superposition of both being alive and dead, until the box is opened and the state is measured.

While this is a problem at first sight, there is a way to go around it. First, a measurement needs not be a conscious process. In fact, the whole box always interacts with the environment, and that interaction causes quantum decoherence and breaking of superposition.

It should be mentioned that there are other interpretations of quantum mechanics. The many-worlds interpretation states (this is an over-simplification) that when the box is opened, reality splits into two versions - one where the cat is alive, and another where the cat is dead.

I should note that all that I said above is a simplified version of the real picture, because discussing the topic in detail would require you to have a solid background in physics.

If you have any questions about this mess of an answer I just wrote, don't hesitate to ask.